Re: [PATCH v1] ACPI / scan: Acquire device_hotplug_lock in acpi_scan_init()

Michal Hocko
2019-07-26T08:44:12Z

On Fri 26-07-19 10:36:42, David Hildenbrand wrote:
> On 26.07.19 10:31, Michal Hocko wrote:
[...]
> > Anyway, my dislike of the device_hotplug_lock persists. I would really
> > love to see it go rather than grow even more to the hotplug code. We
> > should be really striving for mem hotplug internal and ideally range
> > defined locking longterm.
>
> Yes, and that is a different story, because it will require major
> changes to all add_memory() users. (esp, due to the documented race
> conditions). Having that said, memory hotplug locking is not ideal yet.

I am really happy to hear that we are on the same page here. Do we have
any document (I am sorry but I am lacking behind recent development in
this area) that describes roadblocks to remove device_hotplug_lock?
--
Michal Hocko
SUSE Labs